<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Dear Andrew </div><div id="AppleMailSignature">I know that many physicists feel free to use concepts of negative time, energy and as in here, mass. The maths of reversible linear equations allows that. My basic assumptions, and for reasons I have thought through, are that physics should be based on our macroscopic ideas of what is real - so no negative mass for me ( except on a diet). Having said that I do not think there is a time dimension...it is emergent.<br>cheers</div><div id="AppleMailSignature">Vladimir<br>_____________________<div><a href="http://vladimirtamari.com">vladimirtamari.com</a></div></div><div><br>On 13 Mar 2016, at 2:29 pm, Andrew Meulenberg <<a href="mailto:mules333@gmail.com">mules333@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>Dear Wolf,<br><br></div>Your raised a sore point with me. You stated:<br><div><div><div><pre style="margin-left:40px" cols="72"><big>"Newton assumed F=m*a. I do not think its the <br>whole story, but it's certainly simple."</big></pre>I agree that there is more to the story. I have felt that F= |m|*a is more of the story; but Newton, in his age, would never have considered that possibility. I think that, along with negative energy and charge, negative mass should be considered as real. However, this consideration was/is blocked by F= m*a. Is there another reason, why it is not considered? Have you (or anyone else in the group) encountered the usage of the absolute value in this context before, or a reason why it might not be more valid than the original? (Of course the concept should be carried thru many other sacrosanct equations in physics.)<br><br>Andrew</div></div></div></div><div id="DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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